Converter pulse width modulation strategies for three phase regenerative drives
a technology of regenerative drive and pulse width, which is applied in the direction of dynamo-electric converter control, dc motor stoppers, sustainable buildings, etc., can solve the problems of occupying valuable enclosure space, adding system cost, and requiring an overall derating of input and output capabilities, and active front and rectifier/converters may also exhibit increased switching loss associated with the operation of the converter
Active Publication Date: 2019-08-13
OTIS ELEVATOR CO
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AI Technical Summary
Benefits of technology
The proposed solution enhances power converter efficiency by approximately 25% compared to traditional space vector PWM techniques, allowing for higher power ratings and reduced component sizing, thus improving operational efficiency and thermal management.
Problems solved by technology
Oversizing input filter components and switching devices adds cost to the system and occupies valuable enclosure space.
Active front and rectifiers / converters may also exhibit increased switching loss associated with operation of the converter switching devices under such conditions.
Moreover, operation of an active front end power conversion system in boost mode may require an overall derating of the input and output capabilities of the converter.
However, such derating is inherently in efficient and may render a power conversion system unsuitable or not cost effective for a given application.
Method used
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[0025]In general, embodiments herein relate to a regenerative drives employing an active converter to supply a DC bus that in turn supplies voltage to an inverter that generates motor excitation signals to drive a motor. The regenerative drives take advantage of the ability of an electric motor to act as a generator when the weight of the car and counterweight cause the desired movement as long as the drive machine allows the drive sheave to be moved accordingly. Such regenerative drive machines typically employ a three phase converter to supply a DC bus. Described her in several embodiments are techniques of controlling the switching devices of the converter to reduce switching losses under selected conditions and improve efficiency to enable operation in boost mode or beyond conventional ratings. Improvements in efficiency facilitate reductions in heat dissipated, and permit packaging size reductions.
[0026]Embodiments herein are directed to configuring and controlling the converte...
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A three-phase regenerative drive employing multiple converter pulse width modulation (PWM) strategies. The drive includes a three-phase converter having inputs for connection to a three-phase AC source, the three-phase converter having three phase legs, a DC bus operably connected to the three-phase converter wherein the three phase converter is configured to direct current from the three-phase AC source to the DC bus, and a three-phase inverter operably connected to the DC bus and a motor, the three phase inverter configured to draw current from the DC bus and provide three phase command signals to the motor. The three-phase converter employs a first PWM strategy to supply current to the DC bus, and the converter employs a second PWM strategy to supply current to the DC bus if a total current in the three phase legs exceeds a selected threshold.
Description
TECHNICAL FIELD[0001]The subject matter disclosed herein relates generally to conveyance systems, and more particularly to a conveyance system having regenerative three phase drives selectively employing multiple pulse width modulation (PWM) techniques to control an active converter.BACKGROUND[0002]Electric motors are well known and widely used. They come in a variety of sizes and styles. One example use of an electric motor is in an elevator machine that moves a drive sheave for propelling an elevator cab up or down through a hoistway, for example. Another use for an electric motor in a heating ventilation, air conditioning or refrigeration systems (HVACR).[0003]Recently, regenerative drive machines have been introduced particularly into elevator systems. Regenerative drive machines include an electric motor that draws power from a power source for purposes of moving a car and counterweight through a hoistway in a first direction and generates power that is provided back to the pow...
Claims
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IPC IPC(8): H02P11/04H02P27/16H02P3/14H02P27/08H02P11/00
CPCH02P27/085H02P27/16H02P3/14H02P2209/13H02M1/126H02M5/4585H02M7/219H02M7/5395Y02B70/10H02M1/0009H02M1/0048Y02B50/00
Inventor AGIRMAN, ISMAIL
Owner OTIS ELEVATOR CO